curl --request GET \
  --url https://api.masternautconnect.com/connect-webservices/services/public/v1/customer/{customerId}/user/{userId} \
  --header 'Authorization: Bearer <token>'

{
  "userName": "<string>",
  "fullName": "<string>",
  "emailAddress": "<string>",
  "roleId": "<string>",
  "externalIdentifier": "<string>"
}